diff --git a/rgbenv b/rgbenv
index 1fe7765..72970a2 100755
--- a/rgbenv
+++ b/rgbenv
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 # SPDX-License-Identifier: MIT
 #
@@ -22,6 +22,29 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
+if ! (command -v bash 2>&1 > /dev/null); then
+	echo "Sorry, rgbenv requires bash."
+	exit 1
+fi
+
+if [ "${SHELL}" != "$(command -v bash)" ]; then
+	# Prevent boundless recursion
+	if [ -z "${REEXEC_COUNT}" ]; then
+		RGBENV_REEXEC_COUNT=0
+	else
+		RGBENV_REEXEC_COUNT=$(expr ${RGBENV_REEXEC_COUNT} + 1)
+	fi
+	export RGBENV_REEXEC_COUNT
+	
+	if [ "${RGBENV_REEXEC_COUNT}" -gt 1 ]; then
+		exit
+	fi
+	
+	exec /usr/bin/env bash "${0}" "${@}"
+fi
+
+set -euo pipefail
+
 # --------------- Constant defines -------------------------------------------------
 
 RGBDS_GIT="https://github.com/gbdev/rgbds"